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Q341. Which congestion-avoidance or congestion-management technique can cause global synchronization?
A. Tail drop
B. Random early detection
C. Weighted random early detection
D. Weighted fair queuing
Tail drop treats all traffic equally and does not differentiate between classes of service. Queues fill during periods of congestion. When the output queue is full and tail drop is in effect, packets are dropped until the congestion is eliminated and the queue is no longer full.
Weighted Random Early Detection
WRED avoids the globalization problems that occur when tail drop is used as the congestion avoidance mechanism on the router. Global synchronization occurs as waves of congestion crest only to be followed by troughs during which the transmission link is not fully utilized. Global synchronization of TCP hosts, for example, can occur because packets are dropped all at once. Global synchronization manifests when multiple TCP hosts reduce their transmission rates in response to packet dropping, then increase their transmission rates once again when the congestion is reduced.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcfconav.ht ml#wp1002048
Q342. Refer to the exhibit.
Video Source S is sending interactive video traffic to Video Receiver R. Router R1 has multiple routing table entries for destination R. Which load-balancing mechanism on R1 can cause out-of-order video traffic to be received by destination R?
A. per-flow load balancing on R1 for destination R
B. per-source-destination pair load balancing on R1 for destination R
C. CEF load balancing on R1 for destination R
D. per-packet load balancing on R1 for destination R
Per-packet load balancing guarantees equal load across all links, however potentially the packets may arrive out-of-order at the destination as differential delay may exist within the network.
Reference: http://www.cisco.com/en/US/products/hw/modules/ps2033/prod_technical_reference09186 a00800afeb7.html
Q343. Which two statements about MPLS VPNs are true? (Choose two.)
A. PE routers maintain customer routes in the VPN for that customer.
B. They use the explicit-null label by default.
C. P routers are used only for label transit.
D. P routers maintain customer routes in the VPN for that customer.
E. They support only one route target.
F. Each interface on a PE router must have its own VRF.
Q344. DRAG DROP
Drag and drop each PHB on the left to the functionality it performs on the right.
Q345. DRAG DROP
Q346. Which IP SLA operation type is enhanced by the use of the IP SLAs Responder?
C. ICMP Echo
D. UDP Echo
Figure 1. UDP Echo Operation
Response time (round-trip time) is computed by measuring the time taken between sending a UDP echo request message from Device B to the destination device--Device A--and receiving a UDP echo reply from Device A. UDP echo accuracy is enhanced by using the IP SLAs Responder at Device A, the destination Cisco device. If the destination device is a Cisco device, then IP SLAs sends a UDP datagram to any port number that you specified. Using the IP SLAs Responder is optional for a UDP echo operation when using Cisco devices. The IP SLAs Responder cannot be configured on non-Cisco devices.
Q347. Refer to the exhibit.
What is the PHB class on this flow?
This command shows the TOS value in hex, which is 80 in this case. The following chart shows some common DSCP/PHB Class values:
DSCP - TOS Binary
101110 - 101110xx
001000 - 001000xx
100000 - 100000xx
110000 - 110000xx
Network control 2
111000 - 111000xx
Q348. Refer to exhibit.
The router is unreachable using telnet. Which option is solution?
A. Use an extended access list instead of standard access list.
B. The transport output telnet command must be added.
C. The VRF configuration must be completed.
D. The “vrf-also” keyword must be added to the access-class configuration.
Q349. Which two options are benefits of EIGRP OTP? (Choose two.)
A. It allows EIGRP routers to peer across a service provider without the service provider involvement.
B. It allows the customer EIGRP domain to remain contiguous.
C. It requires only minimal support from the service provider.
D. It allows EIGRP neighbors to be discovered dynamically.
E. It fully supports multicast traffic.
F. It allows the administrator to use different autonomous system numbers per EIGRP domain.
EIGRP Over the Top (OTP) allows EIGRP routers to peer across a service provider infrastructure without the SP’s involvement. In fact with OTP, the provider won’t see customer routes at all. EIGRP OTP acts as a provider-independent overlay that transports customer data between the customer’s routers. To the customer, the EIGRP domain is contiguous. A customer’s EIGRP router sits at the edge of the provider cloud, and peers with another EIGRP router a different location across the cloud. Learned routes feature a next hop of the customer router — not the provider. Good news for service providers is that customers can deploy EIGRP OTP with their involvement
Q350. Which protocol uses a proprietary 2-byte Type field for multiple protocol support?
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